I'm new to the forum but I've been using STK as a part of my neuroscience research. It's a great open source software for my research.

I want to know if there is anyway that I can disable the nitro and speed boost features in STK. I'm trying to create most naive driver game play experience involving only forward and lateral kart movements for a neuroscience experiment. Please let me know how I can go on about doing this.

For collectible speed boosts, you can edit file "data/powerup.xml" (where data is will depend on your OS). Near the end of the file, you can set all zeros in the "zipper" column and that should remove them. Speed boosts on the ground of tracks cannot be removed, however

As for nitro, however, there is no simple way to do it, except by editing all tracks, or editing the code (not sure you're willing to go there)

We are doing a series of experiments using STK and we plan to see if we can predict the next move of the user (i.e. go left or right) based on looking only at neural response and we want to see how better neural response is in predicting the players movement in comparison to the visual ques in the game (i.e. optical flow).